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Taiwan Semiconductor Corporation SMCJ40C
- Part No.:
- SMCJ40C
- Manufacturer:
- Taiwan Semiconductor Corporation
- Category:
- TVS Diodes
- Package:
- DO-214AB, SMC
- Datasheet:
-
SMCJ40C.pdf
- Description:
- 1500W, 49.4V, 10%, BIDIRECTIONAL
- Quantity:
- Payment:
- Shipping:
Inventory:8,895
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Product details
Overview
SMCJ40C from Taiwan Semiconductor is a bidirectional 1500W surface-mount transient voltage suppressor (TVS) in DO-214AB (SMC) package, with 40V working stand-off voltage (VWM), 44.4–54.3V breakdown voltage (VBR), and 71.4V maximum clamping voltage (VC) at 22A peak pulse current-designed for automotive lighting and ECU power rail protection against ISO 7637-2 Pulse 1/2a/2b/3a/3b transients.
For engineers reviewing the SMCJ40C datasheet, SMCJ40C pinout, SMCJ40C application, or SMCJ40C equivalent, key selection criteria include clamping performance under 10/1000μs surge, bidirectional polarity marking, moisture sensitivity level 1 compliance, and thermal resistance (RθJA = 55°C/W) for PCB layout derating in high-temperature engine compartments.
Technical Context
The SMCJ40C employs a glass-passivated silicon junction optimized for sub-1ps response to fast transients, delivering symmetrical clamping in both directions due to its bipolar construction (C suffix). It meets ISO 7637-2 immunity requirements without external biasing, supporting unidirectional or bidirectional use via cathode band marking or absence thereof.
Its 1500W peak pulse power rating is defined at TA = 25°C with 1ms pulse width per Fig.5, derated linearly above 25°C using the 55°C/W junction-to-ambient thermal resistance. Steady-state power dissipation is limited to 5W, and reverse leakage remains ≤1μA at 40V VWM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VWM | 40 V - Maximum continuous reverse operating voltage before clamping initiates |
| VBR min/max | 44.4 V / 54.3 V - Breakdown occurs within this range at 1 mA test current; ensures robust margin over VWM |
| VC @ IPPM | 71.4 V - Clamped voltage seen by protected circuit during 22 A 10/1000μs surge |
| PPK | 1500 W - Peak transient energy absorption capability at TA = 25°C, critical for automotive load dump survival |
| RθJA | 55 °C/W - Enables thermal design of copper pour and trace width for 150°C max junction temp in 85°C ambient |
| IR @ VWM | <1 μA - Negligible standby leakage, preserving battery life in always-on vehicle modules |
| Polarity | Bidirectional - No cathode marking; symmetric I-V curve eliminates orientation errors in PCB assembly |
Pinout & Package
Package: DO-214AB (SMC), surface-mount, matte tin-plated leads, UL 94V-0 molding compound, 0.210g weight, polarity unmarked for bidirectional operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| Anode (Cathode Band Absent) | Transient return path | Both terminals function identically; no directional current flow requirement-enables placement flexibility |
| Cathode (Cathode Band Absent) | Transient return path | Identical to Anode; bidirectional conduction ensures equal clamping in either polarity swing |
Key Features
| Feature | Design Value |
|---|---|
| ISO 7637-2 compliance | Validated for Pulse 1 (inductive switch-off), Pulse 2a/2b (battery disconnect), and Pulse 3a/3b (switching noise)-no additional filtering needed |
| Glass passivated junction | Enhances long-term reliability under thermal cycling and humidity exposure in automotive under-hood environments |
| Moisture sensitivity level 1 | Zero bake requirement before reflow; compatible with standard SMT lines without dry pack handling |
| Halogen-free & RoHS | Meets IEC 61249-2-21 and EU RoHS directives-supports green manufacturing and end-of-life recycling |
| Fast response time <1 ps | Clamps before sensitive logic or analog circuitry experiences overvoltage stress-critical for CAN/LIN bus IC protection |
Applications
| Automotive Lighting Control | Engine Control Unit (ECU) Power Rail |
|---|---|
Use Scenario: LED headlamp driver subjected to load dump and alternator ripple during ignition cycles. IC Role / Device Role / Timing Role: Bidirectional TVS placed across 12V input rail to clamp positive and negative transients. Use Value: Limits rail voltage to ≤71.4V during 22A surges, preventing damage to buck controller and gate drivers. | Use Scenario: Microcontroller power supply exposed to ISO 7637-2 Pulse 1 (−150V/50Ω) during fuel injector switching. IC Role / Device Role / Timing Role: Primary transient suppression on main 5V/3.3V regulator input, upstream of LDOs. Use Value: Sub-1ps response ensures clamping before MCU reset circuitry triggers, maintaining system uptime. |
| Industrial PLC I/O Module | DC-DC Converter Input Stage |
Use Scenario: 24V digital input channel connected to field wiring subject to EFT bursts and lightning-induced surges. IC Role / Device Role / Timing Role: Interface-side TVS between terminal block and optocoupler input. Use Value: 1500W rating handles repetitive 5kHz EFT bursts per IEC 61000-4-4 without degradation. | Use Scenario: 48V-to-12V isolated DC-DC converter in telecom equipment experiencing hot-swap transients. IC Role / Device Role / Timing Role: Input-side transient absorber parallel to bulk capacitor. Use Value: 71.4V clamping prevents overvoltage stress on primary-side MOSFETs and controller ICs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar transient voltage suppression applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SMBJ40CA (Bourns) | Same DO-214AA (SMB) package; lower PPK = 600W; VC = 64.5V @ 9.5A | Limited to lower-energy transients; unsuitable for ISO 7637-2 Pulse 1/2a in 12V systems | Select only when space-constrained and surge energy is ≤600W |
| 1.5KE40CA (ON Semiconductor) | Through-hole DO-201 package; PPK = 1500W; VC = 64.3V @ 23.3A; higher IR = 5μA @ 40V | Requires wave solder or hand assembly; not suitable for automated SMT lines | Choose only for legacy through-hole designs needing identical electrical specs |
Compared with SMBJ40CA and 1.5KE40CA, the SMCJ40C delivers full 1500W surge capability in an SMT-optimized DO-214AB package with <1μA leakage and bidirectional symmetry-making it the preferred choice for new automotive and industrial SMT designs requiring robust, automated, and compliant transient protection.
Availability
SMCJ40C is available at Aetrix Electronics and suitable for automotive lighting control, engine control unit (ECU) power rail protection, and industrial PLC I/O modules requiring stable component supply across extended temperature ranges and high-reliability production programs.
Supply support for SMCJ40C includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Taiwan Semiconductor Corporation (TSC) is a vertically integrated semiconductor manufacturer specializing in discrete power devices, TVS diodes, rectifiers, and MOSFETs for automotive, industrial, and computing markets.
The SMCJ series was developed specifically for high-energy transient suppression in automotive 12V/24V systems, emphasizing ISO 7637-2 compliance, SMT manufacturability, and thermal robustness in under-hood environments.
FAQ
What is the clamping voltage of the SMCJ40C under a standard 10/1000μs surge?
The SMCJ40C has a maximum clamping voltage (VC) of 71.4 V when subjected to a 22 A peak pulse current with a 10/1000μs waveform. This value is measured per JEDEC standards and defines the upper voltage limit imposed on downstream circuitry during transient events-critical for ensuring compatibility with 75V-rated capacitors and 60V MOSFETs in automotive power rails.
Is the SMCJ40C unidirectional or bidirectional, and how is polarity identified?
The SMCJ40C is a bidirectional TVS diode, indicated by the "C" suffix. Unlike unidirectional variants (e.g., SMCJ40A), it has no cathode band marking and exhibits symmetrical clamping behavior in both polarities. This eliminates orientation errors during automated placement and supports protection of AC-coupled or floating signal lines without polarity constraints.
Does the SMCJ40C meet automotive transient immunity standards?
Yes, the SMCJ40C meets ISO 7637-2 requirements for Pulses 1, 2a, 2b, 3a, and 3b-covering load dump, battery disconnection, and inductive switching transients common in 12V vehicle networks. Its 1500W peak power rating and sub-1ps response ensure compliance without supplemental RC snubbers or additional TVS stages.
What is the maximum steady-state power dissipation rating for the SMCJ40C?
The SMCJ40C has a steady-state power dissipation (PD) rating of 5 W at TA = 25°C. This value applies to continuous DC or low-frequency reverse-biased conditions-not transient events-and must be thermally managed using adequate PCB copper area, given its RθJA of 55°C/W, to maintain junction temperature below 150°C in real-world ambient conditions.
How does the SMCJ40C compare to the SMCJ40A in terms of electrical performance?
The SMCJ40C is bidirectional with symmetrical VBR (44.4–54.3 V) and VC (71.4 V), while the SMCJ40A is unidirectional with identical VBR but slightly lower VC (64.5 V) at 24 A. The SMCJ40C's lack of cathode marking and dual-polarity clamping make it suitable for floating or AC-coupled nodes, whereas the SMCJ40A requires correct orientation and protects only one polarity.
SMCJ40C Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Taiwan Semiconductor Corporation
- Package/Case:
- DO-214AB, SMC
- Series:
- SMCJ
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Type:
- Zener
- Unidirectional Channels:
- -
- Bidirectional Channels:
- 1
- Voltage - Reverse Standoff (Typ):
- 40V
- Voltage - Breakdown (Min):
- 44.4V
- Voltage - Clamping (Max) @ Ipp:
- 71.4V
- Current - Peak Pulse (10/1000µs):
- 22A
- Power - Peak Pulse:
- 1500W (1.5kW)
- Power Line Protection:
- No
- Applications:
- General Purpose
- Capacitance @ Frequency:
- -
- Operating Temperature:
- -55°C ~ 150°C (TJ)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- DO-214AB (SMC)
SMCJ40C FAQ
1.How can I place an order for SMCJ40C through Aetrix?
Please submit a Request for Quotation (RFQ) for SMCJ40C on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for SMCJ40C reliable?
The price and inventory of SMCJ40C are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SMCJ40C is usually 5 days.
3.What payment methods are accepted for SMCJ40C?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SMCJ40C transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SMCJ40C?
SMCJ40C orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SMCJ40C order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for SMCJ40C?
For technical support, including SMCJ40C datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SMCJ40C requirements.
6.How does Aetrix verify that SMCJ40C is sourced from the original manufacturer or authorized distributors?
All SMCJ40C products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that SMCJ40C meets industry standards.
7.What is the process for return or replacement of SMCJ40C?
All SMCJ40C units undergo pre-shipment inspection (PSI). If there is an issue with SMCJ40C, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The SMCJ40C part is unused and in its original packaging.
Return procedure for SMCJ40C:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
SMCJ40C Tags
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